WO2017051705A1

WO2017051705A1 - Machine tool control device, and machine tool equipped with said control device

Info

Publication number: WO2017051705A1
Application number: PCT/JP2016/076233
Authority: WO
Inventors: 尊一中谷; 一彦三宮; 篠原　浩
Original assignee: シチズン時計株式会社; シチズンマシナリー株式会社
Priority date: 2015-09-24
Filing date: 2016-09-07
Publication date: 2017-03-30
Also published as: JPWO2017051705A1; US20180345434A1; KR20180055839A; TW201711793A; EP3354402A1; TWI697379B; US10744611B2; EP3354402B1; JP6783238B2; CN108025413B; EP3354402A4; CN108025413A; KR102623128B1

Abstract

The present invention feeds a cutting tool in the machining feed direction while repetitively moving the cutting tool on the basis of the conditions set by a user, and smoothly cuts a workpiece while separating chips or facilitating the separation of chips. In a machine tool (100) and a control device (C) for the machine tool (100), a control means C1 sets, according to the repetitive movement frequency caused by an operation instruction cycle, the rotational speed of relative rotation while executing the machining of a workpiece W and the repeat count of the repetitive movement per revolution of the relative rotation.

Description

Machine tool control device and machine tool equipped with the control device

The present invention relates to a control device for a machine tool that processes a workpiece while sequentially cutting chips at the time of cutting, and a machine tool provided with the control device.

Conventionally, a workpiece holding means for holding a workpiece, a tool rest for holding a cutting tool for cutting the workpiece, and a relative movement of the workpiece holding means and the tool rest to fix the cutting tool to the workpiece. The workpiece holding means and the tool post are relatively repeated by repeating the relative movement along the machining feed direction at a first speed and a second speed different from each other. 2. Description of the Related Art A machine tool is known that includes repetitive movement means for moving the workpiece and rotation means for relatively rotating the workpiece and the cutting tool (see, for example, Patent Document 1).
The control device of the machine tool drives and controls the rotating means, the feeding means, and the repetitive moving means, the relative rotation between the workpiece and the cutting tool, and the cutting tool relative to the workpiece. The machine tool is caused to perform machining of the workpiece by the feeding operation accompanied by the repetitive movement in the machining feeding direction.

Japanese Patent No. 5033929 (see paragraph 0049)

In the conventional machine tool, the operation command by the control device is issued at a predetermined cycle.
For this reason, the repetitive movement frequency for relatively repetitively moving the workpiece holding means and the tool rest is a limited value resulting from a period in which an operation command can be given by the control device.
However, since the conventional machine tool does not consider the repetitive movement frequency, the number of repetitive movements of the repetitive movement of the cutting tool relative to the work per work rotation with respect to the rotation speed of the relative arbitrary rotation. There is a problem in that the repetitive movement may not be possible under the conditions described above.

Therefore, the present invention solves the problems of the prior art as described above, i.e., the object of the present invention is to feed the cutting tool in the process feed direction while repetitively moving it, while cutting the chips or It is an object to provide a machine tool control device and a machine tool provided with the control device that can smoothly cut a workpiece while easily cutting chips.

The invention according to claim 1 is a cutting tool for cutting a workpiece, a rotating means for relatively rotating the cutting tool and the workpiece, and feeding the cutting tool and the workpiece in a predetermined machining feed direction. Provided in a machine tool comprising feeding means and repetitive movement means for relatively repetitively moving the cutting tool and the workpiece by repeating relative movement at first and second speeds different from each other; In a machine tool control device having control means for causing the machine tool to process the workpiece by a relative rotation between the cutting tool and the workpiece and a feed operation involving reciprocal vibration of the cutting tool with respect to the workpiece. The control means, in accordance with a repetitive movement frequency caused by a period in which an operation command is possible, the rotation speed of the relative rotation when the machining of the workpiece is performed, and the relative rotation By determining the said number of repetitions of iterative movement per rotation of, it is to solve the aforementioned problems.

In addition to the configuration of the machine tool control device according to claim 1, the machine tool control device according to claim 2 is configured such that the repetitive moving means is arranged along the machining feed direction with the cutting tool. By adopting a configuration in which the workpiece is relatively repetitively moved, the above-described problems are solved.

In addition to the configuration of the machine tool control device according to claim 1, the machine tool control device according to claim 3 is configured to control the relative rotation when the machining of the workpiece is performed. A setting means for setting a value of at least one parameter using the rotation speed, the number of repetitions of the repetitive movement per rotation of the relative rotation, and the repetitive movement frequency as parameters, and an unset parameter Is set to a predetermined value, and a correcting means for correcting the parameter value set by the setting means based on the parameter value is provided, thereby solving the above-mentioned problems.

In addition to the configuration of the machine tool control device according to any one of claims 1 to 3, the machine tool control device according to claim 4 is configured such that the first speed is the second speed. The above-mentioned problem is further solved.

In addition to the configuration of the machine tool control device according to claim 4, the machine tool control device according to claim 5 is configured such that the repetitive moving means is subjected to cutting during relative movement at the first speed. The above-described problem is further solved by adopting a configuration in which the cutting tool and the workpiece are relatively repetitively moved so that the portion and the cutting portion at the time of relative movement at the second speed overlap each other. Is.

In addition to the configuration of the machine tool control device according to any one of claims 3 to 5, the correction unit includes the repetitive moving frequency in addition to the configuration of the machine tool control device according to any one of claims 3 to 5. The unset parameter is set to a predetermined value so that the rotation speed and the number of repetitions are inversely proportional to each other, and the value of the set parameter is corrected. It solves the problems that have been solved.

In addition to the configuration of the machine tool control device according to any one of claims 3 to 6, the machine tool control device according to claim 7 is a parameter that is set by the setting means. The number of repetitions is set to a predetermined number of predetermined values, and the repetitive movement frequency is set to a predetermined value inherent in the control device, and set by the setting unit. The above-described problem is further solved by correcting the value of the number of rotations based on the value of the number of repetitions and a repetitive moving frequency determined.

In addition to the configuration of the machine tool control device according to any one of claims 3 to 6, the machine tool control device according to claim 8 is a parameter set by the setting means, The number of rotations and the number of repetitions are set, and the correction unit corrects the set number of rotations and the number of repetitions to the value of the number of rotations and the number of repetitions determined based on the repetitive movement frequency. As a result, the above-described problems are further solved.

The machine tool according to claim 9 is provided with the control device according to any one of claims 1 to 8, thereby solving the above-described problem.

The machine tool control device of the present invention is a condition that is determined by the control means, while the cutting tool is repeatedly moved to the machine tool in the process feed direction, while cutting the chips or making the chips easy to be cut, The workpiece can be cut smoothly.

Also, the machine tool of the present invention can smoothly cut the workpiece while the chips are divided or the chips are easily divided by the control device of the machine tool.

The figure which shows the outline of the machine tool of the Example of this invention. Schematic which shows the relationship between the cutting tool of an Example of this invention, and a workpiece | work. The figure which shows the repetitive movement and position of the cutting tool of the Example of this invention. The figure which shows the relationship of the spindle nth rotation of the Example of this invention, n + 1st rotation, n + 2 rotation. The figure which shows the modification of the repetitive movement waveform shown in FIG. The figure which shows the relationship between the command period of the Example of this invention, and a repetitive movement frequency. The figure which shows the relationship between the frequency | count of repetition of the repetitive movement per main shaft rotation of the Example of this invention, the rotation speed, and the repetitive movement frequency. The rotation speed table corresponding to the said repetition frequency and repetitive movement frequency shown as a modification of the correction | amendment by the correction | amendment means of the Example of this invention.

The present invention is different from a cutting tool for cutting a workpiece, a rotating unit for relatively rotating the cutting tool and the workpiece, and a feeding unit for feeding the cutting tool and the workpiece in a predetermined processing feed direction. Provided in a machine tool having repetitive moving means for relatively repetitively moving the cutting tool and the workpiece by repeating relative movement at the first speed and the second speed, In a control device for a machine tool having a control means for causing the machine tool to process the workpiece by a general rotation and a feed operation accompanied by a reciprocating vibration of the cutting tool with respect to the workpiece, the control means has a cycle in which an operation command can be issued. In accordance with the resulting repetitive movement frequency, the relative rotation speed when performing workpiece machining and the number of repetitive movement repetitions per one rotation of the relative rotation are determined. Thus, under the conditions determined by the control means, the cutting tool is smoothly moved to the machine tool while feeding the cutting tool in the process feed direction, while cutting the chips or cutting the chips easily. Any specific embodiment may be used as long as it can be used.

FIG. 1 is a diagram schematically illustrating a machine tool 100 including a control device C according to an embodiment of the present invention.
The machine tool 100 includes a main shaft 110 and a cutting tool table 130A.
The spindle 110 holds the workpiece W via the chuck 120 as a workpiece holding means.
The main shaft 110 is supported by the main shaft 110A so as to be rotationally driven by the power of a main shaft motor (not shown).
As the main spindle motor, a conventionally known built-in motor formed between the main spindle 110A and the main spindle 110 in the main spindle 110A can be considered.

The headstock 110A is mounted on the bed side of the machine tool 100 so as to be movable in the Z-axis direction, which is the axial direction of the main shaft 110, by the Z-axis direction feed mechanism 160.
The spindle 110 is moved in the Z-axis direction by the Z-axis direction feed mechanism 160 via the spindle stock 110A.
The Z-axis direction feed mechanism 160 constitutes a main shaft moving mechanism that moves the main shaft 110 in the Z-axis direction.

The Z-axis direction feed mechanism 160 includes a base 161 integrated with a fixed side of the Z-axis direction feed mechanism 160 such as the bed, and a Z-axis direction guide rail 162 provided on the base 161 and extending in the Z-axis direction. Yes.
A Z-axis direction feed table 163 is slidably supported on the Z-axis direction guide rail 162 via a Z-axis direction guide 164.
A mover 165a of the linear servo motor 165 is provided on the Z-axis direction feed table 163 side, and a stator 165b of the linear servo motor 165 is provided on the base 161 side.

The headstock 110 A is mounted on the Z-axis direction feed table 163, and the Z-axis direction feed table 163 is driven to move in the Z-axis direction by driving the linear servo motor 165.
As the Z-axis direction feed table 163 moves, the headstock 110A moves in the Z-axis direction, and the spindle 110 moves in the Z-axis direction.

The cutting tool base 130 A constitutes a tool rest on which a cutting tool 130 such as a cutting tool for processing the workpiece W is mounted and holds the cutting tool 130.
An X-axis direction feed mechanism 150 is provided on the bed side of the machine tool 100.

The X-axis direction feed mechanism 150 includes a base 151 that is integral with the bed side, and an X-axis direction guide rail 152 that extends in the X-axis direction perpendicular to the Z-axis direction in the vertical direction.
The X-axis direction guide rail 152 is fixed to the base 151, and an X-axis direction feed table 153 is slidably supported on the X-axis direction guide rail 152 via the X-axis direction guide 154.
A cutting tool base 130A is mounted on the X-axis direction feed table 153.

The linear servo motor 155 includes a mover 155a and a stator 155b. The mover 155a is provided on the X-axis direction feed table 153, and the stator 155b is provided on the base 151.
When the X-axis direction feed table 153 is moved in the X-axis direction along the X-axis direction guide rail 152 by driving the linear servo motor 155, the cutting tool base 130A is moved in the X-axis direction, and the cutting tool 130 is moved in the X-axis direction. Moving.
A Y-axis direction feed mechanism may be provided.
The Y-axis direction is a direction orthogonal to the illustrated Z-axis direction and X-axis direction.
The Y-axis direction feed mechanism can have the same structure as the X-axis direction feed mechanism 150.

By mounting the X-axis direction feed mechanism 150 on the bed via the Y-axis direction feed mechanism, the Y-axis direction feed table is moved in the Y-axis direction by driving the linear servo motor, and the cutting tool base 130A is moved in the X-axis direction. In addition, the cutting tool 130 can be moved in the X-axis direction and the Y-axis direction by moving in the Y-axis direction.

The Y-axis direction feed mechanism may be mounted on the bed via the X-axis direction feed mechanism 150, and the cutting tool table 130A may be mounted on the Y-axis direction feed table.

The turret moving mechanism (X-axis direction feeding mechanism 150 and Y-axis direction feeding mechanism) and the main shaft moving mechanism (Z-axis direction feeding mechanism 160) cooperate with each other by the X-axis direction feeding mechanism 150 and the Y-axis direction feeding mechanism. The cutting mounted on the cutting tool table 130A by the movement of the cutting tool table 130A in the X-axis direction and the Y-axis direction and the movement of the main shaft table 110A (main shaft 110) in the Z-axis direction by the Z-axis direction feed mechanism 160. The tool 130 is fed in an arbitrary machining feed direction relative to the workpiece W.
The rotation of the main shaft 110 and the movement of the X-axis direction feed mechanism 150, the Z-axis direction feed mechanism 160, and the like are controlled by the control device C.

The main shaft 110 and the cutting tool base 130A are moved by the feeding means composed of the main shaft moving mechanism (Z-axis direction feeding mechanism 160) and the tool post moving mechanism (X-axis direction feeding mechanism 150 and Y-axis direction feeding mechanism). By moving the cutting tool 130 in an arbitrary processing feed direction relative to the workpiece W, the workpiece W is cut into an arbitrary shape by the cutting tool 130 as shown in FIG. Processed.

In the present embodiment, both the headstock 110A and the cutting tool base 130A are moved. However, the headstock 110A is fixed so as not to move to the bed side of the machine tool 100, and the tool post moving mechanism. The cutting tool base 130A may be configured to move in the X-axis direction, the Y-axis direction, and the Z-axis direction.
In this case, the feeding means is composed of a tool post moving mechanism that moves the cutting tool base 130A in the X-axis direction, the Y-axis direction, and the Z-axis direction, and is fixedly positioned and rotated relative to the main spindle 110. By moving the cutting tool base 130A, the cutting tool 130 can be processed and fed to the workpiece W.

Further, the cutting tool base 130A may be fixed so as not to move to the bed side of the machine tool 100, and the spindle moving mechanism may be configured to move the spindle base 110A in the X axis direction, the Y axis direction, and the Z axis direction. .
In this case, the feed means is composed of a spindle stock moving mechanism that moves the spindle stock 110A in the X-axis direction, the Y-axis direction, and the Z-axis direction. By moving 110 A, the cutting tool 130 can be processed and fed with respect to the workpiece W.

In this embodiment, the X-axis direction feed mechanism 150, the Y-axis direction feed mechanism, and the Z-axis direction feed mechanism 160 are configured to be driven by a linear servo motor. However, conventionally known ball screws and servo motors are used. It is also possible to drive by.

In the present embodiment, the rotating means that relatively rotates the workpiece W and the cutting tool 130 is constituted by the main shaft motor such as the built-in motor, and the relative rotation between the work W and the cutting tool 130 is performed by the main shaft. The rotation is performed by 110.
In the present embodiment, the workpiece W is rotated with respect to the cutting tool 130. However, the cutting tool 130 may be rotated with respect to the workpiece W.
In this case, the cutting tool 130 may be a rotary tool such as a drill.
The rotation of the main shaft 110, the Z-axis direction feed mechanism 160, the X-axis direction feed mechanism 150, and the Y-axis direction feed mechanism are driven and controlled by the control unit C 1 using the control unit C 1 included in the control device C as control means.
Unlike the relative movement at the first speed and the relative movement at the first speed, the control unit C1 uses the feeding mechanisms as repetitive moving means at a second speed slower than the first speed. The spindle 110 and the cutting tool base 130A are controlled to move in the respective directions while the spindle 110 and the cutting tool 130 are relatively repetitively moved by repeating the relative movement.

As shown in FIG. 3, each feed mechanism is controlled by the control unit C 1 to move the spindle 110 or the cutting tool base 130 A by a predetermined advance amount as a relative movement at the first speed in one repetitive movement. After moving forward in the moving direction, it stops in each moving direction as a relative movement at the second speed, is moved in each moving direction by the amount of advance, and cooperates to process the cutting tool 130 with respect to the workpiece W. Send in the feed direction.

As shown in FIG. 4, the machine tool 100 includes a Z-axis direction feed mechanism 160, an X-axis direction feed mechanism 150, and a Y-axis direction feed mechanism, while the cutting tool 130 moves repeatedly along the machining feed direction, The workpiece W is machined by being fed in the machining feed direction using the amount per rotation of the spindle, that is, the amount when the spindle phase changes from 0 degrees to 360 degrees as the feed amount.

While the workpiece W is rotated, the head stock 110A (main shaft 110) or the cutting tool base 130A (cutting tool 130) moves while being repetitively moved, and the cutting tool 130 forms the outer shape of the work W into a predetermined shape. In this case, the peripheral surface of the workpiece W is cut into a curved shape along a waveform of repetitive movement.
In addition, in the virtual line (one-dot chain line) passing through the valley of the curved waveform, the change amount of the position when the main axis phase changes from 0 degree to 360 degrees indicates the feed amount.
As shown in FIG. 4, the repetition number N of the repetitive movement of the head stock 110A (main shaft 110) or the cutting tool base 130A per rotation of the workpiece W is 1.5 times (repetitive movement per rotation). The number of repetitions N = 1.5) will be described as an example.

In this case, the phase of the peripheral shape of the workpiece W to be turned by the n-th rotation (n is an integer of 1 or more) of the main shaft 110 and the n + 1-th cutting tool 130 is shifted in the main-axis phase direction (horizontal axis direction of the graph). .
For this reason, the position of the valley of the phase at the (n + 1) th rotation (the upwardly convex curve portion in FIG. 4 where the movement is switched from the relative movement at the first speed to the stop at the second speed in the dotted waveform graph) is the phase at the nth rotation. Is shifted in the main axis phase direction with respect to the position of the valley (curved portion protruding upward in FIG. 4 of the solid line waveform graph).

Thereby, the location where the distance between the movement locus (solid line waveform graph) of the cutting tool 130 at the nth rotation and the movement locus (dotted line waveform graph) of the cutting tool 130 at the (n + 1) th rotation is shortened occurs.
In this part, since the width of the chips generated from the workpiece W is narrowed, the chips are easily divided so that the chips are broken at this part.

Further, as shown in FIG. 5, the relative movement at the first speed such as the forward movement of FIG. 4 and the relative movement at the second speed are replaced with the first speed in the machining feed direction instead of the stop of FIG. The movement at a speed slower than the first speed in the same direction as the movement direction may be repeated.
Thereby, compared with the repetitive movement shown in FIG. 4, it is possible to increase the feed amount and increase the cutting efficiency.

As shown in FIG. 5, the distance between the movement locus (solid line waveform graph) of the n-th rotation cutting tool 130 and the movement locus (dotted line waveform graph) of the (n + 1) -th rotation cutting tool 130 is the same as in FIG. , The part which becomes short arises.
In this part, since the width of the chips generated from the workpiece W is narrowed, the chips are easily divided so that the chips are broken at this part.
As described above, for the repetitive movement by the repetitive movement means of the present invention, the second speed in the machining feed direction may be zero, and the relative movement at the second speed is in the same direction as the relative movement at the first speed. Alternatively, the direction of relative movement at the second speed may be opposite to the direction of relative movement at the first speed, and reciprocal vibration in the machining feed direction may be used.

In the case of this reciprocating vibration, the trajectory of the cutting tool 130 at the time of backward movement (relative movement at the second speed) at the (n + 1) th rotation of the workpiece circumferential surface is controlled by the control unit C1 at the nth rotation of the workpiece circumferential surface. By reaching the trajectory of the cutting tool 130, the cutting portion at the time of relative movement at the first speed and the cutting portion at the time of relative movement at the second speed come into contact with each other, that is, it is possible to partially overlap. It becomes.
As a result, in the repetitive movement, the cutting part at the time of relative movement at the first speed of the cutting tool 130 includes the cutting part at the time of relative movement at the second speed as a theoretical “point”. Since the idle swinging operation in which the cutting tool 130 moves away from the workpiece W occurs at the “point” during the relative movement at the speed, the chips generated from the workpiece W at the time of the cutting are removed by the above-described swinging motion (the cutting at the relative movement at the first speed). The processing part and the cutting part at the time of relative movement at the second speed contact each other in order).

As for the relationship between the n-th rotation and the n + 1-th rotation, the phases of the shapes turned by the cutting tool 130 on the workpiece W at the n-th rotation and the n + 1-th rotation do not have to be the same (same phase), and are not necessarily 180 degrees. There is no need to reverse it.
For example, the number N of repeated movements per rotation can be 1.1, 1.25, 2.6, 3.75, or the like.
It is also possible to set so that repetitive movement less than one time (0 <the number of repetitions N <1.0) is performed by one rotation of the workpiece W.
As a result, the main shaft 110 rotates by one or more rotations per one repetitive movement (the repetitive movement is repeated once for many rotations).

In the machine tool 100, the operation command by the control unit C1 is performed at a predetermined command cycle.
The repetitive movement of the head stock 110A (main shaft 110) or the cutting tool base 130A (cutting tool 130) can be operated at a predetermined frequency based on the command cycle.
For example, in the case of the machine tool 100 that can send a command 250 times per second by the control unit C1, the operation command by the control unit C1 is performed in a cycle of 1/250 = 4 (ms) (reference cycle).

The command period is determined based on the reference period, and is generally an integer multiple of the reference period.
It becomes possible to execute repetitive movement at a frequency corresponding to the value of the command period.
As shown in FIG. 6, for example, when 16 (ms), which is four times the reference period (4 (ms)), is used as the command period, the relative movement at the first speed and the second speed are performed every 16 (ms). Relative movement of the spindle head 110A (spindle 110) or the cutting tool stage 130A (cutting tool 130) is repeatedly moved at 1 ÷ (0.004 × 4) = 62.5 (Hz). be able to.

Others 1 ÷ (0.004 × 5) = 50 (Hz), 1 ÷ (0.004 × 6) = 41.666 (Hz), 1 ÷ (0.004 × 7) = 35.714 (Hz) , 1 ÷ (0.004 × 8) = 31.25 (Hz), etc., the headstock 110A (spindle 110) or the cutting tool base 130A (cutting tool 130) is repeatedly moved only at a plurality of predetermined jumping frequencies. Can be made.

The frequency (repetitive movement frequency) f (Hz) of the repetitive movement of the main spindle 110A (the main spindle 110) or the cutting tool base 130A (the cutting tool 130) is determined to a value selected from the above frequencies.
Depending on the control device C (control unit C1), the command cycle can be set by a multiple other than an integer multiple of the reference cycle (4 ms).
In this case, the frequency according to this command cycle can be set as the repetitive movement frequency f.

When the spindle stock 110A (spindle 110) or the cutting tool stand 130A (cutting tool 130) is repeatedly moved, if the rotation speed of the spindle 110 is S (r / min), the number N of repeated movements per rotation is N. Is determined as N = f × 60 / S.
As shown in FIG. 7, the number of rotations S and the number of repetitions N are inversely proportional with the repetitive movement frequency f as a constant.
The main shaft 110 can rotate at a higher speed as the repetitive moving frequency f is increased and as the number N of repetitions is decreased.

In the machine tool 100 of the present embodiment, the rotational speed S, the number of repetitions N, and the repetitive movement frequency f are used as parameters, and the user sets two of the rotational speed S and the number of repetitions N of the three parameters by the user. The control unit C1 can be set via the numerical value setting unit C2 or the like.
The setting of the number of revolutions S or the number of repetitions N to the control unit C1 can be performed by inputting the number of revolutions S or the value of the number of repetitions N as a parameter value to the control unit C1, for example, the number of revolutions S or the number of repetitions. The value of the number of times N can be set and described in a machining program, or the number of times of repetition N can be set as an argument in a program block (one line of the program).

In particular, if the setting means is configured so that the number of repetitions N can be set as an argument in the program block of the machining program, the rotation speed S of the spindle 110 generally described on the machining program and the program block A user can easily set the number of rotations S and the number of repetitions N from the machining program based on the number of repetitions N described as an argument.
The setting by the setting means may be made by a program, or may be set by the user via the numerical value setting unit C2.

Further, the peripheral speed and the workpiece diameter can be set and inputted via a machining program or the like, and the rotational speed S can be calculated and set based on the peripheral speed and the workpiece diameter.
By configuring the setting means so as to calculate the rotational speed S based on the peripheral speed set and inputted through a machining program or the like and the workpiece diameter, the material of the workpiece W, the type, shape, and material of the cutting tool 130 are configured. The rotation speed S can be easily set without the user being aware of the peripheral speed determined according to the above.

The control unit C1 rotates the spindle 110 at the rotation speed S based on the set rotation speed S and the repetition number N, and at this repetition number N, the cutting tool 130 is repetitively along the machining feed direction. Control is performed so that the head stock 110A or the cutting tool base 130A is moved while being repetitively moved so as to be fed in the machining feed direction while moving.

However, since the rotation speed S and the repetition number N are determined due to the repetitive movement frequency f as described above, the control unit C1 sets the set rotation speed S and the repetition number N to the repetitive movement frequency f. Correction means for correcting based on this is provided.
The correcting means sets the repetitive moving frequency f to a value having a value close to a value calculated from the set number of repetitions N and the number of rotations S based on N = 60 f / S, The number of repetitions N and the number of revolutions S can be corrected to values close to the set values according to the target moving frequency f.

For example, assume that the user sets S = 3000 (r / min) and N = 1.5.
In this case, since the value of the repetitive moving frequency is 75 (Hz) from S = 3000 (r / min) and N = 1.5, the correcting means is, for example, the repetitive moving frequency f = 62.5 (Hz). ).
Based on the set repetitive movement frequency (62.5 Hz), for example, the correction means maintains the rotation speed S (3000 (r / min)) and corrects the number of repetitions N = 1.25, The number of rotations N (1.5) is maintained and the number of revolutions S is corrected to 2500 (r / min).
It is also possible to correct both the repetitive movement frequency f = 50 (Hz), the rotational speed S = 2400 (r / min), and the number of repetitions N = 1.25.

Under the condition based on the number of repetitions N and the number of rotations S set by the setting unit by correcting the number of rotations S and the number of repetitions N by the correcting unit, the machine tool 100 can perform the Z-axis direction feed mechanism 160, X The axial feed mechanism 150 and the Y-axis direction feed mechanism feed the cutting tool 130 in the machining feed direction while repetitively moving along the machining feed direction, while cutting the chips or making the chips easy to cut. The cutting of W can be performed smoothly, and in some cases, for example, the life of the cutting tool 130 can be extended.
As a result, the workpiece W can be machined under conditions relatively close to the rotational speed S and the number of repetitions N intended by the user.

At this time, the correction condition can be changed by preferentially correcting either the rotation speed S or the number of repetitions N or correcting both according to the processing conditions.
The repetitive movement frequency f used by the setting means may be set in advance on the user side, and the repetition number N and the rotation speed S may be corrected according to the set repetitive movement frequency f. .

In this case, with the control unit C1 being in a particularly stable control state, the cutting tool 130 is repeatedly moved along the processing feed direction while being fed in the processing feed direction, while cutting the chips or making the chips easy to be cut, The external cutting of the workpiece W can be performed smoothly and stably.

On the other hand, in order to shorten the machining cycle time, it is desirable to set the rotation of the spindle 110 as fast as possible.
For this purpose, it is necessary to make the repetitive movement frequency f as high as possible, but it is not easy to set it higher than necessary from the viewpoint of stable control and the like.
For this reason, it is possible to increase the number of revolutions S as much as possible by making the number of repetitions N as small as possible.

At this time, by setting the setting means so as to set the number of repetitions N with the number of rotations S of the spindle 110 per one repetitive movement, the setting for increasing the number of rotations S can be easily performed.
By setting the number of rotations S of the main shaft 110 per one repetitive movement to 1 or more and setting the number of repetitions N to a number greater than 0 and less than 1, the main shaft 110 can be rotated at high speed. .
However, since the length of the chips to be divided becomes relatively long, the number of repetitions N needs to be set to such an extent that the processing is not adversely affected.

In the present embodiment, the number of repetitions N and the number of rotations S among the three parameters are configured to be set in the control unit C1 via the numerical value setting unit C2 or the like. The value is fixed and no input is required, the user sets only the rotation speed S as one of the three parameters, and the repetitive movement frequency f is set according to the rotation speed S and the repetition number N. Then, the rotation speed S or the number of repetitions N may be corrected.

Further, when the user sets only the rotation speed S as one of the three parameters, the control unit C1 sets the vibration frequency corresponding to each repetitive movement frequency with respect to the set rotation speed S. It is also possible to set the number of repetitions N so that the chips are divided by the reciprocating vibration of the cutting tool 130 without correcting the set rotation speed S.
In this case, the control unit C1 executes the reciprocating vibration of the cutting tool 130 at a repetitive moving frequency f that is the number of repetitions N set by the control unit C1 with respect to the rotation speed S set by the user. However, if it is difficult to set the number of repetitions N such that the chips are divided as described above due to the rotational speed S set by the user or the repetitive moving frequency that can be operated, the reciprocating vibration is performed by the control unit C1. It is also possible to configure so that the amplitude of is adjusted to a value such that chips are divided.

Further, the correction means of the control unit C1 is configured to correct the set rotational speed S based on the repetitive movement frequency f, and as shown in FIG. 8, the control unit C1 performs the repetition per one rotation of the main shaft. The rotational speeds S11, S12, S13,... Of the main shaft 110 corresponding to the repetitive movement numbers N1, N2, N3,..., And the repetitive movement frequencies f1, f2, f3,. .., S31... May be provided, and the correction means may correct the value of the rotation speed S set by the user to the value of the rotation speed S in the table.

DESCRIPTION OF SYMBOLS 100 ... Machine tool 110 ... Spindle 110A ... Spindle 120 ... Chuck 130 ... Cutting tool 130A ... Cutting tool stand 150 ... X-axis direction feed mechanism 151 ... Base 152 ... X-axis direction guide rail 153 ... X-axis direction feed table 154 ... X-axis direction guide 155 ... Linear servo motor 155a ... Movable element 155b ... Stator 160 ... Z-axis Direction feed mechanism 161 ... Base 162 ... Z-axis direction guide rail 163 ... Z-axis direction feed table 164 ... Z-axis direction guide 165 ... Linear servo motor 165a ... Movable element 165b ...・ Stator C ・・・ Control device C1 ・・・ Control part C2 ・・・ Numerical value setting part W ・・・ Workpiece

Claims

A cutting tool for cutting a workpiece, a rotating means for relatively rotating the cutting tool and the workpiece, a feed means for feeding the cutting tool and the workpiece in a predetermined machining feed direction, and different first speeds And a repetitive moving means for relatively repetitively moving the cutting tool and the workpiece by repeating relative movement at the second speed, and provided in a machine tool,
In a machine tool control device having control means for causing the machine tool to process the workpiece by a relative rotation between the cutting tool and the workpiece and a feed operation involving reciprocal vibration of the cutting tool with respect to the workpiece. ,
According to the repetitive moving frequency resulting from the period in which the operation command can be issued, the control means performs the rotation of the relative rotation when performing machining of the workpiece, and per rotation of the relative rotation. A machine tool control device for determining the number of repetitive movements.
2. The machine tool control device according to claim 1, wherein the repetitive movement means is configured to relatively repetitively move the cutting tool and the workpiece along the machining feed direction.
The number of rotations of the relative rotation when performing machining of the workpiece, the number of repetitions of the repetitive movement per rotation of the relative rotation, and the repetitive movement frequency are parameters, and at least 1 A setting means for setting the values of two parameters;
The machine tool according to claim 1 or 2, further comprising: a correcting unit that sets an unset parameter to a predetermined value and corrects the parameter value set by the setting unit based on the parameter value. Control device.
The machine tool control device according to any one of claims 1 to 3, wherein the first speed is set to be larger than the second speed.
The repetitive moving means moves the cutting tool and the workpiece relative to each other so that a cutting portion at the time of relative movement at the first speed overlaps with a cutting portion at the time of relative movement at the second speed. The machine tool control device according to claim 4, wherein the control device is configured to repetitively move.
The correction means is a constant based on the repetitive moving frequency, and sets an unset parameter to a predetermined value and corrects the set parameter value so that the rotation speed and the repetition count are inversely proportional to each other. 6. The machine tool control device according to claim 3, wherein the machine tool control device is configured to perform the control.
The parameter set by the setting means is the rotation speed,
The correction means sets the number of repetitions to a predetermined number of predetermined values, sets the repetitive movement frequency to a predetermined value inherent in the control device, and sets the rotation set by the setting means The machine tool control device according to any one of claims 3 to 6, wherein the number value is corrected based on a value of each number of repetitions and a predetermined repetitive movement frequency.
The parameters set by the setting means are the number of rotations and the number of repetitions,
The said correction | amendment means is comprised so that it may correct | amend the said rotation speed and the said repetition frequency which were set to the value of the said rotation frequency and the said repetition frequency determined based on the said repetitive movement frequency. The machine tool control device according to any one of the above.
A machine tool comprising the control device according to any one of claims 1 to 8.